Today's Thesis
The Bond Market Is Now Pricing Two Different Nightmares at Once
Government borrowing costs — the interest rates the US, UK, Germany, France, and Japan all pay to borrow — hit their highest level since 2007 today, and stocks fell hard, with the Nasdaq down 1.33% leading the retreat. The proximate trigger is the Iran ceasefire falling apart and Brent crude climbing back above $91 a barrel, reviving inflation fears. But a second, more troubling thread showed up today too: Bank of America's Michael Hartnett is warning investors to avoid bonds altogether, pointing not at the war but at the $40 trillion national debt — meaning even if the oil shock fades, the flood of government and AI-related borrowing competing for the same money may not.
What's Actually Driving This
War fears reignite the oil shock while a structural debt warning suggests it may not matter
YIELD SPIKE, ROUND TWO
The ceasefire's collapse just pushed borrowing costs to their worst level since 2007.
Yesterday's multi-decade high in government borrowing costs was already tied to oil and gas prices climbing on Iran-war fears. Today that fear got worse: the US-Iran ceasefire effectively broke down, Trump threatened to bomb Oman, and Brent crude jumped back above $91 a barrel — feeding straight into inflation expectations and pushing bond yields (the interest rate governments and companies pay to borrow) to their highest since 2007, the year before the financial crisis.
This piece resolves with the war. If the ceasefire is restored and oil retreats, this specific leg of the yield spike unwinds within days — it is not a structural condition on its own.
THE DEBT SUPPLY PROBLEM
A top Wall Street strategist just told investors to avoid the bonds they'd normally run to in a crisis.
Hartnett's warning is a different claim from the oil story — it says the government's $40 trillion debt load, combined with AI companies raising enormous sums to build data centers, means there's simply too much new debt being sold relative to the savings available to buy it. That's a permanent oversupply argument, not a war-driven shock, and one strategist's call is noise on its own — but it lines up with two straight sessions of rising yields, which is why it's worth tracking rather than dismissing.
Watch actual demand at the next government bond sale. If buyers keep showing up at reasonable rates despite the warnings, this is noise. If an auction shows investors demanding a notably higher interest rate than the market expected, the structural story is confirmed — and yields won't come down even after oil does.
The Core Dynamic
Everyone Is Borrowing From the Same Well at Once
Picture a small-town bank that usually handles a handful of loan requests a week. Now the government shows up needing a massive loan to cover its deficit, AI companies show up needing enormous loans to build data centers, and ordinary households still want mortgages — all drawing from the same pool of available savings. When demand for borrowed money outruns the supply of savings, the price of that money — the interest rate — rises no matter what happens with oil. This version is harder than the usual borrowing squeeze because it has two accelerants burning at once: a war-driven inflation scare on top of a structural collision between government deficits and AI capital spending, each pushing rates the same direction.
Historical Precedent
Two Very Different Ways a Borrowing-Cost Spike Can End
2022
The UK's mini-budget under Liz Truss proposed unfunded tax cuts, and gilt yields (UK government bond rates) spiked so violently the Bank of England had to step in with emergency bond purchases within days. Truss resigned 44 days later, and yields fell almost as fast as they'd risen once the fiscal plan was reversed.
When a yield spike is caused by a specific, reversible policy decision, it can unwind almost as fast as it appeared.
2011
Italy's borrowing costs kept climbing for over a year on doubts about its debt load relative to the size of its economy — not a single shock, but a slow-building loss of confidence. It only stabilized in mid-2012 when the European Central Bank pledged to do 'whatever it takes' to backstop the debt.
When investors doubt the sheer volume of debt itself, only a credible backstop — not a single good headline — brings rates back down.
Directional Read
The variable that matters this week is which of the two stories is actually driving yields. If it's the war, then any de-escalation — a restored ceasefire, oil sliding back under its recent levels — should bring borrowing costs down quickly, and richly priced tech stocks bounce first. If it's the debt-supply story, borrowing costs stay elevated even after the war fades, because the problem is simply too much new debt chasing too little savings. Hold this for the week: your mortgage rate right now has less to do with the Fed than with whether the world still wants to lend Washington money at these prices.
Scenario A — War De-escalates: The US-Iran ceasefire is restored and Brent falls back under $85 a barrel, inflation fear fades, and government borrowing costs pull back from their 2007-era highs.
Scenario B — Debt Supply Wins: A government bond auction shows weak demand even while oil holds steady, confirming the structural oversupply story and keeping borrowing costs elevated regardless of how the war resolves.